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Engine backfire and missing


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Old 12-06-2018, 10:17 PM
Jumpingjoe628's Avatar
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Engine backfire and missing

05 RC with 26k miles

So lately Iíve been noticing that at random times my engine will misfire and or backfire when driving. First time it happened it was right after I fully filled the tank. I was lightly accelerating on an entrance ramp to the interstate and it was bucking like crazy. I tried to keep it running but would miss and backfire. So I let it die and pulled over onto the shoulder. Turned the key off and then restarted it. Seemed fine so I took off again, same thing at about 3k rpm but the lighter with the throttle I went the less it happened. Milked it home a few miles but got on it hard on my street and it was like nothing happened, all better....so I thought. As time went on I was cautious driving thinking it would happen again. I thought maybe a one way valve at the fuel neck may have gotten gummed up from filling the tank and not allowing it vent to atmosphere but....

The second time it happened was at about half tank, this time it happened at light throttle just cruising with rpm at about 2k. I let it die and while still rolling restarted it and kept driving. Didnít happen again during that short trip and also made it back home with no issue. No codes have been thrown yet about any misfire and itís getting frustrating. I do however have a emission evac small leak code (probably from a hose somewhere) but checked all of what I can get to for leaks. Even replaced the gas cap and had the code cleared but no dice, it came back after 40 miles or so.

Now it happens randomly and canít pin point anything that may lead me to investigate further. I just recently replaced the spark plugs Andy the old ones looked great and no change. Injector cleaner? Seafoam? Coils / wire?

Whatís everyone think?

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Old 12-07-2018, 03:18 AM
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I remember mine was doing this a few weeks before it lost power completely, and it was a bad Cat
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Old 12-07-2018, 03:12 PM
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At 26K you shouldn’t have any issues with coils but it’s possible. Start with the spark plugs and wires and work your way back to the coils. A fuel treatment wouldn’t hurt either, especially if your truck isn’t driven very often.
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Old 12-07-2018, 04:56 PM
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Could be a few things, Bad injector or your TPS could be going out. Mine would stall out like that and it turn out to be the TPS
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Old 12-07-2018, 05:57 PM
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No CEL is hard to diagnose, especially over a keyboard
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Old 12-07-2018, 08:27 PM
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Thanks for the responses guys, I’m gonna start with injector cleaner since it doesn’t get driven daily and I just replaced the plugs. After that I’ll replace the wires and it looks like I’ll have to remove the intake to get them off so I’ll probably do a proper catch can set up and suck out any oil that’s accumulated in there while it’s off.
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Old 12-08-2018, 08:45 AM
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Quote:
Originally Posted by Jumpingjoe628 View Post
Thanks for the responses guys, Iím gonna start with injector cleaner since it doesnít get driven daily and I just replaced the plugs. After that Iíll replace the wires and it looks like Iíll have to remove the intake to get them off so Iíll probably do a proper catch can set up and suck out any oil thatís accumulated in there while itís off.
Clean the throttle body mate, it could be hanging up? My SRT8 Jeep has a habit of that, and the 10 did it a few times in the past.

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Old 12-08-2018, 09:48 AM
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Originally Posted by Silver05 View Post
I remember mine was doing this a few weeks before it lost power completely, and it was a bad Cat
I'd head this advise. Sounds like a Cat that has become dislodged internally. Get underneath and see if you can bang on the cats. If one rattles, the honeycomb platinum substrate has broke loose. This causes a "clog" upon high exhaust flow (more throttle).
Happened exactly as you described to my 1996 V8 Dakota.

Good Luck! Cheers!
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Old 12-08-2018, 10:35 AM
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Quote:
Originally Posted by Psycho1122 View Post
I'd head this advise. Sounds like a Cat that has become dislodged internally. Get underneath and see if you can bang on the cats. If one rattles, the honeycomb platinum substrate has broke loose. This causes a "clog" upon high exhaust flow (more throttle).
Happened exactly as you described to my 1996 V8 Dakota.

Good Luck! Cheers!
My cats are under the workbench in the garage

Be a good excuse to de cat maybe
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Old 12-08-2018, 11:08 AM
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I’m all for de-catting, as when I got the truck the rears were already deleted. So now since my knowledge with modern tech computers and what they control on these newer vehicles is limited (always had older hot rods), how will the sensors react when the cats are removed? The front sensor before the cat shouldn’t be a problem but the post cat sensor will likely not detect properly and probably throw a code. Is there some sort of delete attachment to plug into the wire instead of using the sensor itself so as not to throw a code. It’s not like we have emissions testing here but I really don’t wanna see the CEL lit on the dash if I can help it.
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